Studies should identify local mosquito species that play a role in WNV transmission, including those that might serve as a “bridge” from birds to human beings.
研究应确定当地传播西尼罗河病毒的蚊子种类，包括可能“桥接”鸟类和人类的蚊子。
The human deaths from H5N1 have so far occurred as a result of direct infection from birds - except in two outbreaks where rare human-to-human transmission appears to have occurred.
至今所有死于禽流感的患者除了两例罕见人与人之间传播的病例外，均为直接从鸟类感染。
Widespread prevalence of the virus in birds increases the chance of transmission from bird to human.
病毒在鸟类中广泛传播增加了从鸟类传染到人类的机会。
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